单选题 Speaker A. Mr. Carson, Dr. Brown will have to change your appointment to tomorrow at the same time. He's still waiting for a flight out of New York.Speaker B: ______

A、 Oh, well, thank you for calling. I'll see him in his office then.
B、 I'm sorry to hear that his flight is delayed.
C、 But are you sure he will be in his office at that time?
D、 Yes. That's quite understandable.

【正确答案】 A

【答案解析】A方因为改动预约时间而向B方致歉，需要B方作出反应。A项的回答非常礼貌，表示同意，是这一对话场景下的正确答案。